Commutator for dynamo-electric machines.



F. S. MARTIN. COMMUTATOR FOB DYNAMO ELECTRIC MACHINES.

Patented. Oct. 31, 1911.

APPLICATION FILED 00118, 1909.

. the two rings together FREDERICK S. MAB.TIN O33 EDGEW'OCD PARK; EENNSYLVANIA, AESIGNOR TO WEST- INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

com-acumen FOR DYNAn ,occ, oca.

To all whom it may concern- Be it known that l, l iicormcn S. MARTIN, a citizen of the United. vStates, and a resident of Edgcwood Purl: in the county of Allegheny and Stateof is operating.

As heretofore cmistructed, connmitatom for dynamo-electric machines have usually comprised plurality of bars or segments provided with ll-shaped end notches and mounted upon a bushing or sleeve having a V-shaped annular projection at its inner end and a so called l!-ringuadjuslably mounted on its outer end for clamping the bars in position.

According to my present invention, it provide a plurality of clamping rings which are so arranged that only one surface of each ring engages a surjjace of the assembled commutator bars, the other surface of the V-ring being adjacent to a'second ring and corresponding to the single V-ring of the prior art. By this means, I secure. a more perfect contact between the bars '01 segments and the rings and so prevent the displacement or vibration of the bars when the commutator is in operation. Each of the ring segments is separatcly adjustable and one of the clamping nuts is so mounted upon the other that the two serve to lock each'othcr in position.

Figure 1 of the accompanying drawings is a sectional elevation of a. portion of dynainc-electric machine embodying my invention. Fig. 2 is a view correspendingto l ig. l but illustrating a structure which is spcciall y adapted for long, high-speed com-- mutators such as arc embodied in direct current tin-larger]orator 3 Referring to the drawings, the 'ructure here shown comprises magnetinablo core member 1, a supporting frame or spider :2, a cylindrical projection or sleeve 3' and a commutator cylinder 4 which is mounted on .aid projection or sleeve. The commutator Specification of L Application filed Gctober 223,

i i l i l l l LEC'IRIC MACHINES.

n Patented @ct. 31. 1911.. Serial No. 523,125.

plurality of segments and i in its respective ends. Two concentric clan'iping rings 8 and 9 projcctinto the annular recess formed by the V-shaped witches at each end of the cylinder and two concentric clamping nuts 10 and 11 are mounted upon ch. end of the projection 3 to' en the concentric rings and force them the notches (i and '7. The two scts'of s 10 and 11 are similar and t 10 is screw-threaded upon one end of the sleeve 3 and the outer nut 11 is I sci-cw-lliremled upon the inner nut 10. The nuts 10 s e to adjust the rings 8 and the (nuts 11 .o adjust the rings 9. ltwill be at means other than those sperings 15 next located 'adjac' n; to the nuts. The commutator segmen s are then assembled in radial planes about outer cylindrical surface of the sleeve 3. the notches 7 being in engagement with the" concentric rings. The ring 8 of the set at the outer end is then placed in position on thd sleeve to engage the inner surface: of the annular groove formed by the notches 6. The ring 9 of the same set is then mounted directly on the ring 8 to engage the outer surface of the same annular groove. The nut 10 of the outer set is then-screwed upon the end of the sleeve 3 and is forced into engagement with the iging 8, which. in turn, 'il-fldS to draw the commutator bars inwardly, and, since they are wedge shaped in section in the usual manner they are clamped firmly together,

the bars or :nents of the connnutator are securely loci ad against vibration.

It will be readily understood by those familiar with the wt that when dynamo} electric machines are o 'icrating at very-high 1 speeds the centrifugal forces to which the commutators are subjected are often very great and tend to displace the bars. It is therefore essential to get an excellent contact surface between the clamping rings and the annulargrooves formed by the notches in the commutator segments. It is obpre'ss'ure between the two surfaces of an integral V-shap-ed ring and the groove in the commutator cylinder.

In Fig. 2, the usual commutator bushing is replaced by a pair of similar bushings 12 and 13 which-are fitted upon the shaft 14 of a dynamo elec'tric machine, and each of the commutator bars 15 is provided with dovetail projections 16 and 17 The bushings 12 and 13 are provided with V shaped projec-- 'tions 18 and 19 at their adjacent ends and with concentric rings 8 and land clamping -nuts 10 and-11 at their outer ends, which it trifugal forces to securely clam the dove-tail projections between the V -s aped projections of, the bushstead of belng placed directly on the shaft 14 if it is desired to provide for removing the'shaft without disturbing the commutator. V

I desire that structural modifications which do not depart from the spirit of my invention shall be included withinits scope.

I claim as my invention: 1. A-commutator for dynamo-electric machines comprising a plurality of bars or segments having registering notches of V shape to form an annular groove and concentric superposed clamping rings seated in said grooveand independently adjustable to secure the bars in position. v

I A commutator for dynamoelectric machines comprising a plurality of bars or seg-" ments having registering notches of V shape viously extremely difiicult to get an equal posed concentric V-shaped in their ends to form annular grooves and concentric superposed clamping rings seated in each groove and independently adjustable for securing the parts in position.

3. A commutator for dynamo-electric machines comprising a sleeve or bushing, a plurality of bars or segments radially mounted thereon and two pairs of superrings for clamping the bars in position, each of the bars being notched at its ends to provide annular V-shaped grooves in the assembled structure to receive the rings.

1. A commutator for dynamo-electric machines comprising a sleeve or bushing, a plurality of bars or segments, two sets of superposed concentric clamping rings therefor and means for independently adjusting each of the clamping rings of each set.

5. A commutator for dynamo-electric machines comprising a sleeve or bushing, a plurality of bars or segments, two sets of concentric clamping rings therefor and means, for independently I adjusting each of the clamping rings of each set, the inner rings of said sets tending to draw the'bars to-" gether and the outer rings tending to force them radially outward.

6. A'commutator for dynamo-electric Ina- I 'chines comprising a sleeve or bushing, a plurality of bars or segments, two sets of superposed concentric clamping rings therefor and two sets of superposed concentric clamping nuts screwed upon the sleeve orbushing at itsrespective ends and severally adapted'to engage the respective rings. V 8.0 In testimony whereof, I have hereunto subscribed my name this 6th day of Oct., 1909 FREDERICK s. MARTIN;

Witnesses:

R. J .-DEARBORN, B. B. HINES. 

